What are the merits and demerits of friction?

Dear student,
Merits of friction:
1: Friction allows use to write on the paper or whiteboard.
2: It allows us to walk on ground. Due to less friction, it is difficult to walk on slippery surfaces like ice.
3: Asteroids are burnt due to friction and do not reach the earth. So friction protects us from asteriods.
4: Application of brakes while driving is possible due to friction.
Demerits of friction:
1: Friction causes wear and tear of parts of machines. It damages shoe soles with time as there is friction between shoe soles and ground on which we walk.
2: Presence of friction poses need of application of extra power to make machines to perform their function.
3: Forest fires are caused by friction between tree branches and damages valuable plant and animal species.
Regards.
 

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Merits
1. We can walk cuz of friction
2. We can write cuz of friction
3. A matchstick can be lighted cuz of fric
4. Plates, glass, spoons etc stay on the table top
5. Athletes are able of run
6. We do not slip
7. Cars, bikes etc are able to stop
8. Friction holds a screw in wood
9. If there was no fric and an object started moving, it would not be able to stop

Demerits
1. It wastes a lot of energy
2. Efficiency of a machine decreases
3. There will be greater wear and tear
4. Fric produces lots of heat, it gets wasted
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